Which of the Following Is an Example of Vygotsky's Zone

Multiple Choice

Which of the following is an example of Vygotsky's zone of proximal development?

A) Figuring out the answer to your math homework after your sister gives you a hint
B) Getting a better grade on the math test than you usually get
C) Using trial and error to eliminate incorrect answers to a problem
D) Thinking about a purely abstract problem like how many digits there are in infinity